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liquibase.serializer.core.yaml.YamlSerializer Maven / Gradle / Ivy
package liquibase.serializer.core.yaml;
import liquibase.change.ConstraintsConfig;
import liquibase.changelog.ChangeSet;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.serializer.LiquibaseSerializable;
import liquibase.serializer.LiquibaseSerializer;
import liquibase.statement.DatabaseFunction;
import liquibase.statement.SequenceCurrentValueFunction;
import liquibase.statement.SequenceNextValueFunction;
import liquibase.structure.core.Column;
import liquibase.structure.core.DataType;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;
import org.yaml.snakeyaml.introspector.GenericProperty;
import org.yaml.snakeyaml.introspector.Property;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.representer.Represent;
import org.yaml.snakeyaml.representer.Representer;
import org.yaml.snakeyaml.resolver.Resolver;
import java.beans.IntrospectionException;
import java.lang.reflect.Type;
import java.util.*;
public abstract class YamlSerializer implements LiquibaseSerializer {
protected Yaml yaml;
public YamlSerializer() {
yaml = createYaml();
}
protected Yaml createYaml() {
DumperOptions dumperOptions = new DumperOptions();
if (isJson()) {
dumperOptions.setPrettyFlow(true);
dumperOptions.setDefaultFlowStyle(DumperOptions.FlowStyle.FLOW);
dumperOptions.setDefaultScalarStyle(DumperOptions.ScalarStyle.DOUBLE_QUOTED);
dumperOptions.setWidth(Integer.MAX_VALUE);
} else {
dumperOptions.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
}
return new Yaml(new Constructor(), getLiquibaseRepresenter(), dumperOptions, getLiquibaseResolver());
}
protected LiquibaseRepresenter getLiquibaseRepresenter() {
return new LiquibaseRepresenter();
}
protected LiquibaseResolver getLiquibaseResolver() {
return new LiquibaseResolver();
}
protected boolean isJson() {
return "json".equals(getValidFileExtensions()[0]);
}
@Override
public String[] getValidFileExtensions() {
return new String[]{
"yaml",
"yml"
};
}
@Override
public String serialize(LiquibaseSerializable object, boolean pretty) {
if (isJson()) {
String out = yaml.dumpAs(toMap(object), Tag.MAP, DumperOptions.FlowStyle.FLOW);
return removeClassTypeMarksFromSerializedJson(out);
} else {
return yaml.dumpAsMap(toMap(object));
}
}
protected Object toMap(LiquibaseSerializable object) {
Comparator comparator;
comparator = getComparator(object);
Map objectMap = new TreeMap<>(comparator);
for (String field : object.getSerializableFields()) {
Object value = object.getSerializableFieldValue(field);
if (value != null) {
if (value instanceof DataType) {
value = ((Map) toMap((DataType) value)).values().iterator().next();
}
if (value instanceof Column.AutoIncrementInformation) {
value = ((Map) toMap((Column.AutoIncrementInformation) value)).values().iterator().next();
}
if (value instanceof ConstraintsConfig) {
value = ((Map) toMap((ConstraintsConfig) value)).values().iterator().next();
}
if (value instanceof LiquibaseSerializable) {
value = toMap((LiquibaseSerializable) value);
}
if (value instanceof Collection) {
List valueAsList = new ArrayList((Collection) value);
if (valueAsList.isEmpty()) {
continue;
}
for (int i = 0; i < valueAsList.size(); i++) {
if (valueAsList.get(i) instanceof LiquibaseSerializable) {
valueAsList.set(i, toMap((LiquibaseSerializable) valueAsList.get(i)));
}
}
value = valueAsList;
}
if (value instanceof Map) {
if (((Map) value).isEmpty()) {
continue;
}
for (Object key : ((Map) value).keySet()) {
Object mapValue = ((Map) value).get(key);
if (mapValue instanceof LiquibaseSerializable) {
((Map) value).put(key, toMap((LiquibaseSerializable) mapValue));
} else if (mapValue instanceof Collection) {
List valueAsList = new ArrayList((Collection) mapValue);
if (valueAsList.isEmpty()) {
continue;
}
for (int i = 0; i < valueAsList.size(); i++) {
if (valueAsList.get(i) instanceof LiquibaseSerializable) {
valueAsList.set(i, toMap((LiquibaseSerializable) valueAsList.get(i)));
}
}
((Map) value).put(key, valueAsList);
}
}
}
objectMap.put(field, value);
}
}
Map containerMap = new HashMap<>();
containerMap.put(object.getSerializedObjectName(), objectMap);
return containerMap;
}
protected Comparator getComparator(LiquibaseSerializable object) {
return new Comparator() {
@Override
public int compare(String o1, String o2) {
return o1.compareTo(o2);
}
};
}
private String removeClassTypeMarksFromSerializedJson(String json) {
json = json.replaceAll("!!int \"(\\d+)\"", "$1");
json = json.replaceAll("!!bool \"(\\w+)\"", "$1");
json = json.replaceAll("!!timestamp \"([^\"]*)\"", "$1");
json = json.replaceAll("!!float \"([^\"]*)\"", "$1");
json = json.replaceAll("!!liquibase.[^\\s]+ (\"\\w+\")", "$1");
if (json.contains("!!")) {
throw new IllegalStateException(String.format("Serialize failed. Illegal char on %s position: %s", json.indexOf("!!"), json));
}
return json;
}
public static class LiquibaseRepresenter extends Representer {
public LiquibaseRepresenter() {
init();
}
protected void init() {
multiRepresenters.put(DatabaseFunction.class, new AsStringRepresenter());
multiRepresenters.put(SequenceNextValueFunction.class, new AsStringRepresenter());
multiRepresenters.put(SequenceCurrentValueFunction.class, new AsStringRepresenter());
}
@Override
protected Set getProperties(Class type) throws IntrospectionException {
Set returnSet = new HashSet<>();
LiquibaseSerializable serialzableType = null;
try {
if (type.equals(ChangeSet.class)) {
serialzableType = new ChangeSet("x", "y", false, false, null, null, null, null);
} else if (LiquibaseSerializable.class.isAssignableFrom(type)) {
serialzableType = (LiquibaseSerializable) type.newInstance();
} else {
return super.getProperties(type);
}
} catch (InstantiationException | IllegalAccessException e) {
throw new UnexpectedLiquibaseException(e);
}
for (String property : serialzableType.getSerializableFields()) {
returnSet.add(new LiquibaseProperty(property, String.class, String.class));
}
return returnSet;
}
private static class LiquibaseProperty extends GenericProperty {
private LiquibaseProperty(String name, Class aClass, Type aType) {
super(name, aClass, aType);
}
@Override
public void set(Object object, Object value) throws Exception {
//not supported
}
@Override
public Object get(Object object) {
return ((LiquibaseSerializable) object).getSerializableFieldValue(getName());
}
}
private class AsStringRepresenter implements Represent {
@Override
public Node representData(Object data) {
return representScalar(Tag.STR, data.toString());
}
}
}
public static class LiquibaseResolver extends Resolver {
// Adapted from: CustomResolver.java (YAML Sources)
@Override
protected void addImplicitResolvers() {
// This adds all the YAML standard resolvers except for the one that resolves Date and Timestamp
// values automatically.
addImplicitResolver(Tag.BOOL, BOOL, "yYnNtTfFoO");
addImplicitResolver(Tag.INT, INT, "-+0123456789");
addImplicitResolver(Tag.FLOAT, FLOAT, "-+0123456789.");
addImplicitResolver(Tag.MERGE, MERGE, "<");
addImplicitResolver(Tag.NULL, NULL, "~nN\0");
addImplicitResolver(Tag.NULL, EMPTY, null);
// Do not "resolve" (read: mess with) dates and timestamps (Tag.TIMESTAMP removed)
addImplicitResolver(Tag.YAML, YAML, "!&*");
}
}
}
